IMHO the Bronco would be a better choice. American, two spinners, longer loiter time, better cockpit visibility. Putting some P&Ws on there might match or exceed the range of the Tucano? And apparently we gave it a shot at the amphib ops already. Just sayin.
I am not sure where you are getting longer loiter time but the Super Tucano has much more range than an OV-10. Not only that but from everything I can read the Tucano has much more payload capability. Only significant airframe modifications are going to allow the OV-10 to match many of the capabilities of the Tucano and that takes time, time that we probably cannot afford at this time if we want to get aircraft into combat sooner rather than later.
And I think the purpose of this aircraft is going to be a bit different than the original OV-10, to a degree. Less FAC and more CAS.
And I could really care less what country makes the plane, if the best equipment is foreign then we should use it.
Down low and slow in the weeds, pissing people off, sooner or later one of those bad guys are going to get off a lucky shot and shut down one of your engines. And believe me, when they call you, they will need you low and slow, down in the weeds.
While it will still have to go down low and slow, precision munitions and targeting pods will negate some of that. Not only that, fortunately for us the enemy is a bit less well equipped than what we faced in 40 years ago.
P.S. While the OV-10 was flown off ships I don't think it was anything more than testing or a fly-off.